Belfast Weather in August

With daytime temperatures of 19°C (66°F) and nighttime lows of 12°C (54°F), August in Belfast brings pleasant temperatures during the day. It is also the wettest month of the year, so pack an umbrella.

Rainfall in Belfast in August

With frequent rain showers this month, having an umbrella on hand will keep you dry. Climate statistics over the past 30 years suggest around 19 days of rain, with 91 mm (3.6 in) average for the month. Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.

Temperature in Belfast in August

If you're visiting Belfast in August, expect highs of 19°C (66°F) and overnight lows around 12°C (54°F). August is a notable month of the summer season. The difference between afternoon and evening temperatures is usually noticeable. With overnight lows of 12°C (54°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Belfast in August

You can expect a moderate amount of sunlight, with approximately 139 hours. This means a pleasant mix of sun and overcast.

Wind Speed in Belfast in August

Wind speeds average 4 m/s (8 knots) during August. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

Average water temperature in August

At 13°C (55°F), the water is cool but manageable for those who don't mind a bit of a shock getting in. Most people adjust after a few minutes.

If you prefer dry days with pleasant temperatures, July typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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For a detailed overview over the year and the best time to visit Ireland, check out our Belfast's climate page.

Belfast Temperature in August

Min Temperature 12°C (54°F)  

Max Temperature 19°C (66°F)  

Water Temperature 13°C (55°F)  

Chance of Rain 64%  

Precipitation 91 mm (3.6 in)  

Rainy days 19 days  

Humidity 89%  

Windspeed 4 m/s (8 knots)  

Sunshine 139 hours  

Percentage Sunshine 29%  

What to Wear in Belfast in August

For Belfast in August, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. With water temperatures around 13°C (55°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Belfast in August

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Ireland, check out our Belfast's climate page.

More climate data for Belfast

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Belfast climate overview or explore weather in Ireland.